Tie-rod for concrete construction



Dec. 5, 1933. L. A. REEVES 1,938,153

TIE ROD FOR CONCRETE CONSTRUCTION Filed March 50. 1931 12 Z. 9 r 7 6 4 z 7 3 W/ll/l/l/l/ kkxm x; I MK llllfl lllww lmmwmm- Patented Dec. 5, 1933 UNITED. STATES; PATENT OFFICE TIE-ROD ron CONCRETE CONSTRUCTION Lerritt A. Reeves, Toronto, Ontario, Canada Application March so, 1931. Serial No. 526,515

3 Claims. (01. 25-131) Y The principal objects of this invention are to provide a tie rod for clamping concrete forms in position which will be extremely reliable and efiicient in use and very simple to manipulate both in setting up and removing the form and which will'be readily adaptable to the construction of either straight or tapering forms and may be furnished at remarkably low cost. I

The principal features of the invention consist 0 in the novel construction of a coupling sleeve for connecting the inner or buried rod with the outer or clamping member, whereby the sleeve and outer clamping members are simultaneously removed and a further feature consists in the novel construction of the outer clamp with a swivel socket co-operating with a part spherical surface on the clamping arm.

In the accompanying drawing, Figure 1 is a cross sectional view through a form showing the invention as applied to vertical and tapered wall surfaces.

Figure 2 is an enlarged part sectional elevational view of the device.

Figure 3 is a plan view of the outer clamp -bracket.

In the construction of concrete walls and abutments it is necessary to provide means for accurately and efiiciently tying the opposing sides of the form in such a manner that the forms will be held from buckling or getting out of line under the very heavy pressure to which they are subjected from the mass of poured concrete and it is desirable that the major portion of the tie shall be removed from the wall after the con- 'crete has set in the simplest possible manner and at the least expense, both in labour and material. The present invention accomplishes these desirable conditions in a very simple manner.

4 The central element of the tie rod consists of a plain piece of steel rod 1 threaded for a short distance at each end.

Sleeve members 2, preferably formed of steel or cast iron, are threaded at one end to receive the threaded end of the rod 1 and the perimeter 3 of this threaded end is tapered.

The outer and parallel end of the sleeve 2 is formed with a threaded orifice 4 which extends inwardly in a left hand thread which terminates threaded with a right hand thread, extend inwardly past the wall 6 of the mould and the ta- 5 pered surface 3 readily releases from the conof the threaded orifice.

short of the inner end of the thread engaging crete upon being rotated in aleft-hand direction as will hereinafter appear.

A rod 7 provided with a left hand threaded end 8 is fitted into the threaded orifice 4 and the end thereof is preferably turned to engage the bottom The outer end of the rod 7 is provided with a right hand thread 9 which in order to provide for a greater speed'in A cast metal plate 10, preferably rectangular in operation is preferably a long pitch square thread.

form, is provided with a centrally arranged boss 11 in which isformed an elliptical orifice l2 which flares from the outer end of the boss inwardly to the flat face of the plate with the long axis of the ellipse arranged lengthwise of the plate. The outward end of the orifice is bevelled to present a concaved edge which is engaged by the part spherical surface 15 of the wing nut 15 threaded on to the right threaded end 9 of the rod '7.

The engagement of the'spherical surface of the nut 16 with the bevelled recess allows the plate 10 to adjust itself to any required anglein accordance with the taper or batter of a wall or it will set in squared or perpendicular arrangement to the rod '7 without stress.

A hole 17 is bored through the outer end of the rod '7 for the insertion of a pin.

In assembling the form. the centre rod, sleeves and outer rods may all be assembled and inserted through the orifices in the form. The

' ened to hold the form securely in position by means of the nuts 16. c

When the concrete has been poured and is set and the moulds or forms are to be removed, it is .merely necessary to slip a pin, which may be an ordinary nail, into the hole 17 and upon turning the nut 16 to the left it backs off from the bracket plate 10 until it engages the pin causing the rod 7 to be rotated in a left-hand direction. The rod 7 is of larger diameter than the rod 1 and upon being turned to the left the end 7 thereof engages the shoulder 2' in the sleeve and rotates the sleeve therewith thereby effecting the unthreading of the right-hand threaded end of the sleeve from the rod 1 which is embedded in the concrete and causing the sleeve to be withdrawn from its embedded position in the concrete. The smooth inner end of the sleeve being tapered, upon being rotated on the threaded rod instantly releases itself from the concrete without breaking or chip- IOQ ping the concrete. The neat round holes left in the concrete by the tapered sleeve 2 may then be easily plugged'in any desired manner.

It will be readily understood from this description that the parts are of extremely simple construction and they are rugged and durable and may be used indefinitely.

It is an important feature ofthis invention that when different diameters of centre rods are required it is merely necessary to change the sleeves 2 for others having a larger diameter of thread at the inner end as the outer threads are suficiently heavy to handle any range of Work, consequently only one set of plates, outer rods and wing nuts will be required. Further, in the event of either coupling sleeves or outer rods beannular shoulder formation on said sleeve between the respective left and right hand threaded portions thereof forming a stop to limit the in- Ward left hand threading movement of said outer rod whereby a continued left hand rotation of the latter effects the unthreading of said sleeve from the right hand threaded centre rod and the extraction of the sleeve from the concrete and clamping means mounted on said outer rod.

2. A tie rod comprising a centre rod threaded at the end, a sleeve having a tapered end threaded on to the threaded end of said rod, a spirally threaded bore in the other end of said sleeve having the threads thereof leading in the reverse direction to the rod engaging thread of the other end, an outer rod spirally threaded into the spiral bore of said sleeve whereby on being rotated relative to the sleeve it may be displaced axially thereinto, means for positively limiting the inward axial displacement of the spirally threaded outer rod to positively interlock the same with the sleeve, whereby on continued rotation of said second mentioned rod to effect the unthreading of the sleeve from the first mentioned rod, and

clamping means co-operating with the outer end of said outer rod.

' 3; A tie-rod, comprising a centre rod threaded with right hand threads, a tapered sleeve threaded on to said centre rod and having a left hand threaded orifice in theouter end, an outer rod left threaded to fit the orifice of said sleeve and having a right thread at the outer end, stop means'for definitely limiting the inward axial displacement of said outer rod in said sleeve whereby a continued left hand rotation of said outer rod effects the unthreading of said sleeve from the right hand threaded centre rod and the extraction of the sleeve from the concrete, a nut threaded on the outer end of said outer rod, and a clampingplate mounted on said outer rod to be engaged by said nut. V v

LERRITT'A. REEVES. 

